Investigation on subgrade reaction of pile with taking effects of cyclic shear strain of soil into account

考虑土体循环剪应变影响的桩基反应研究

• 批准号: 22760415
• 负责人: SUZUKI Hiroko
• 金额: $ 2.66万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22760415/
• 关键词: 基礎構造杭基礎; 地盤剛性; 繰返し履歴; 液状化; 杭; せん断履歴

To propose guideline of scaling factors for subgrade reaction of pile in liquefied ground, effects of cyclic shear strain of soil on subgrade reaction of pile are investigated. The following conclusions may be made: 1) With increasing the relative displacement between piles and soil, the subgrade reaction increases due to recovery of effective stress. With cyclic shear strain of soil, the recovery of effective stress is insignificant and then the subgrade reaction decreases. The decrease in subgrade reaction due to cyclic shear strain is more significant in loose soil than in dense soil; 2) The scaling factor for subgrade reaction might be defined by cyclic number and amplitude of shear stress. The estimated subgrade reaction is in good agreement with the observed one both before and after liquefaction; 3) A decrease in subgrade reaction induces a decrease in shaft friction of piles. This suggests that it is important to consider the equilibrium of vertical load as well as that of horizontal load.

为提出液化地基中桩的地基反力标度系数指标，研究了土的循环剪应变对桩的地基反力的影响。得出以下结论：1)随着桩土相对位移的增大，由于有效应力的恢复，地基反力增大。在土体循环剪应变作用下，有效应力恢复不明显，路基反力减小。在松散土中，循环剪切应变对路基反力的减小作用比在密实土中更为显著；2)路基反力的比例系数可由循环次数和剪应力幅值来确定。地基反力的估算结果与液化前后的观测值吻合较好；3)地基反力的减小导致桩侧摩阻力的减小。这表明，既要考虑水平荷载的平衡，也要考虑竖向荷载的平衡。

项目成果

液状化地 盤の剛性低下が杭の応力に与える影響

液化地基刚度降低对桩应力的影响

• 发表时间: 2010
• 作者: N. Takiyama;Y. Nambu;Y. Hayashi and T. Tai;鈴木比呂子・時松孝次;稲村渓,鈴木比呂子,時松孝次
• 通讯作者: 稲村渓,鈴木比呂子,時松孝次

乾燥地盤・飽和地盤における基礎のスウェイ-ロッキング動が杭応力に与える影響

干燥饱和地基中地基防摇运动对桩应力的影响

• 发表时间: 2011
• 作者: 鈴木比呂子;時松孝次
• 通讯作者: 時松孝次

繰り返しせん断による飽和地盤の剛性低下を評価した地盤反力の推定

地面反作用力的估计，用于评估由于重复剪切而导致的饱和地面刚度的降低

• 发表时间: 2011
• 作者: 南部恭広;多幾山法子;林康裕;稲村渓・鈴木比呂子・時松孝次
• 通讯作者: 稲村渓・鈴木比呂子・時松孝次

Estimation of Bearing Capacity and Pull-out Resistance of a Pile with or without a Wing Plate in Alternately Cyclic Loading based on Centrifugal Model Tests

基于离心模型试验的交替循环荷载下有或无翼板桩的承载力和抗拔力估算

• 发表时间: 2013
• 作者: Hiroko Suzuki;Kei Inamura;Kohji Tokimatsu;Masatoshi Wada and Hideyuki Mano
• 通讯作者: Masatoshi Wada and Hideyuki Mano

液状化地盤の剛性低下が杭の応力に与える影響

液化地基刚度降低对桩应力的影响

• 发表时间: 2010
• 作者: 稲村渓;鈴木比呂子;時松孝次
• 通讯作者: 時松孝次